Portable drilling rig



Jan. 4, 1938. v J. c. CURTIS PORTABLE DRILLING RIG Filed May 21, 1936 s Sheets-Sheet 1 Twang? IMI,\ 0 3 7 J 9 6 3 Q. M a 4 7 4 a w l a ,7 4 9 I I a 6 0 8 4 is 6 5 9 6 a 4, W 5 3 a 5 n z 3 6 w a 2 :1 E

JOHN C. 60,9775

INVENTOR ATTORN EY Jan. 4, 1938. J c -r15 2,104,341

PORTABLE DRILLING RIG Filed May 21, 1936 Y 3 Sheets-Sheet 2 JOHN c. CUFWS E 1 INVENTOR ATTORNEY Ja n. 4, 1938. J. CURTIS 2,104,341

PORTABLE DRILLING RIG Filed May 21/1936 s Sheets-Sheet 5 I w 7 WM? 87II IIIIIIIIIIA Z8 \l I w JOHN c. z/e775 INVENTOR ATTORNEY Patented Jan. 4, 1938 UNITED STATES PATENT OFFICE PORTABLE DRILLING RIG John 0. Curtis, Garfield Heights, Ohio, assignor to The Cleveland Rock Drill Company, Cleveland, Ohio, a corporation of Ohio Application May 21,

8 Claims.

This invention relates broadly to rock drilling equipment, but more particularly to a portable a portable drilling rig best suitable for drilling holes in connection with tunnelling work or the like, the rig being ofa relatively low construction and being equipped with a swingable drill supporting element permitting the drill to be readily moved in any desired drilling position.

Other objects and advantages more or less ancillary to the foregoing, and the manner in which the various objects are attained, reside in the specific construction and aggroupment of the elements peculiar to this structure, aswill become apparent from a more complete examination of this specification, in the claims of which there are assembled certain specific combinations of parts and specific construction indicative of the scope and spirit of the invention.

In the drawings:

Fig. 1 is a side elevational view of the entire apparatus, the drill being shown in a position for drilling vertical holes.

Fig. 2 is a plan view of the apparatus shown as positioned in Fig. 1.

Fig. 3 is an enlarged cross sectional view taken in a plane indicated by line 3-3 in Fig. 1.

Fig. 4 is a view similar to Fig.1 illustrating the drill and its guiding frame in another position.

Fig. 5 is a view similar to Fig. 2 illustrating the drill positioned outside of-.the carriage.

Fig. 6 is an enlarged sectional view taken in a plane indicated by line 6-6 in Fig. 2.

Fig. 7 is an enlarged sectional view taken in a plane indicated by line '|--'I in Fig. 5.

Fig. 8 is an enlarged cross sectional view taken in a plane indicated byline 8-8 in Fig. 7.

Fig. 9 is an enlarged cross sectional view taken in a plane indlcatedby line 9-9 in Fig. 2.

Fig. 10 is an enlarged cross sectional view taken in a plane indicated by line ||l-||l in Fig. 1.

Referring to the drawings in which like symbols designate corresponding parts throughout the several views, there is shown a carrying frame I 5, which for the purpose of illustration is shown to comprise two tubular side members l6 and I1. These two side members are united by an end cross member l8, which has its end portions l9 bent downwardly and its extreme ends welded to the adjacent end of the 1936, Serial No. 81,050

side members to constitute a substantially U- shaped carrying frame formed with an open end. To the middle of the cross member |B, is welded a vertically disposed apertured boss 20, adapted to rotatably receive the shafted portion 2| of a, fork 22, the latter being bent away from the center axis of the shaft 2|. This shafted portion is retained within the boss 20 by a cotter pin 23 extending through the upper end thereof, while "the fork 22 has a shaft 24 transversally therethrough on which is rotatably mounted a supporting wheel 25, the latter forming with the fork 23 a. caster supporting one end of the frame l5.

Welded to each other end of the two side members, there is a relatively flat casting 26 having mounted through the center thereof a bolt 21. This bolt extends under the casting 26 to receive a sleeve or bushing 28 which is clamped against the. casting 26 by a washer 29 and nut 30. R0- tatably mounted on the bushing 28, there is a shaft 3| on which is rotatably mounted a frame supporting wheel 32, which is retained thereon by a pin 33. Adjacent the casting 26, the shaft 3| is formed with a laterally extending flange 34 having a bore 35 vertically therethrough and capable of registration with either of the aper tured bosses 36 formed on the casting 26 and disposed at right angles from each other. Through either of these apertured bosses maybe inserted a locating pin 31, which extends therefrom into the bore 35 of the flange 34 for locking the shaft 3| and wheel 32 in either of three operative positions.

Carried by the side members ,of the carrying frame 15, there is a cross frame 38 comprising two channel bars 39 mounted in spaced relation and having their respective ends united by a top and bottom plate 40 and 4| welded thereto. Under each end of the channel bars 39 between the bottom plate 4| and the corresponding side member of the carrying frame l5, there is interposed a casting 42, the upper wall of which is flat to receive the bottom plate 4|, while the lower wall of this casting is arcuated to fit over the corresponding side member of the frame l5. Under each casting 42, there is a companion cap 43 also formed with an arcuated wall to fit the under side of the corresponding side member of the frame I 5. Each casting 42 and cap 43 is provided with two vertically disposed orifices 44, which are elongated in a transversal direction relative to the frame l5, and adapted to accommodate a bolt 45 which extends through the bottom plate 4|, channel 39 and upper plate 40 to receive a nut 46, by which the cross frame 38 may be rigidly secured to the carrying frame I5. Tor inforce the cross frame 38, the latter is provided halfway between its ends with a box like construction formed of boiler plates welded to the channel bars 39. These plates include top and bottom plates 41 having an enlarged opening formed therethrough in coaxial alignment. and adapted to receive a stanchion or shaft 48 which is welded to the plates. This stanchion extends vertically above the cross frame 38 within the bore 49 of a housing 58 which is rotatably mounted thereon. The bore .49 is terminated by a flat'bottom 5| engaging the free end of the stanchion 48 for supporting the housing 58 thereon. To lock the housing 58 against rotation on the stanchion 48 the former is provided with two apertured bosses 52 having a bolt 53 therethrough adapted to receive a nut 54. These bosses, aswell as the wall of the housing adjacent thereto, are split in the usual manner to effect an efiective clamping action by means of the bolt'and nut 53 and 54.

Extending laterally from the lower end of the housing 58, there is a protuberance 55 having afiat circular wall 56 radially disposed with respect to the stanchion 48. Engaging the wall 56, there is the similarly shaped wall 51 of a head 58 which is welded or otherwise rigidly-secured to one end of a relatively long boom 59. The protuberance 55 and head 58 are apertured to receive a horizontal shaft in the form of a bolt 68 extending transversally therethrough.- This bolt protrudes beyond the protuberance 55 to receive a nut 6| by which the two surfaces 56 and 51 may be clamped against each other. In a counterbore formed within the protuberance 55 and head 58 through which the bolt 68 passes, there is disposed a bushing 62 for maintaining the protuberance 55 and head 68 in coaxial alignment.

The upper end of the housing 58 is shaped like a fork 63, having pivotally secured to its sidewalls-by cap screws 64 a worm gear housing 65. Rotatable within this last housing, there is a worm gear 66 retained therein by a cap 61. The housing 65 is shaped to accommodate a worm 68 meshing with the worm gear 66, and having one end 69 extending from the housing 65 to operatively receive a crank handle (not shown) through which the worm may be rotated. The worm gear 66 is internally threaded to receive a screw or brace I8 longitudinally movable therethrough and having one end pivotally connected by a bolt II to a bracket I2, the latter being welded to the boom 59 at a selected distance from the ends thereof. 1

Mounted within the upper end of the tubular boom 59, there is the cylindrical portion I3 of a bracket I4. To clamp this bracket against rotation, the end of the tube is slotted as at I5, and it has a split collar I6 mounted thereon with a bolt II extending through apertured lugs I8 to receive a nut I9. The cylindrical portion I3 within the end of the boom is provided with an annular groove 88 within which the bolt 11 projects to prevent axial movement of the bracket I4. Externally of the boom 59, the bracket I4 is formed with a flat annular wall 8| engageable with a similarly shaped wall 82 of another bracket 83 which is welded at one end of a relatively short pipe or arm 84. Raised from the wall 82, there is a cylindrical step 85 protruding into a corresponding counterbore formed into the brack-- et I4 for maintaining the two brackets in coaxial alignment. Through these two brackets extends a bolt 88 having a nut 81 thereon, bywhich the brackets may be clamped against relative rotation. Detachably secured on the arm 84 by a clamp 88, there is a drilling mechanism, which is shown for purpose of illustration to comprise an elongated frame89, having guiding elements 98 secured thereto and on which the drilling motor Si is free to slide. To the lower end of the frame 89 is adjustably secured by a cap screw 92, a peg 93, the purpose of which will be explained later. In practice, it will be understood that since the carrying frame I5 is supported by wheels 32 and the caster wheel 25, the entire drilling rig may be moved about the work without difliculty.

When it is desired to move the rig longitudinally with respect to the carrying frame, the wheels 32 may be positioned longitudinally of the frame either outside or inside of the latter, by simply removing the pin 31 and swinging the wheels When it is desired to move the rig transversally of the frame I5, the wheels 32 may be positioned at right angles with the side members of the frame.

Referring now more particularly to the construction supported by the stanchion 48, it will be seen that the housing .58 and boom 59 constitutes a derrick like assembly wherein the boom 59 is capable of pivotal movement on a horizontal axis or bolt 68, and capable of completely revolving around a vertical axis or stanchion 48. By rotating the worm 68 it is evident that rotation is transmitted to the worm gear 66, thus causing the longitudinal movement of the brace or screw I8 through the worm gear 66, and the consequential raising or lowering movement of the boom 59. When the boom 59 has been moved in the desired height, the nut 6| may be tightened to rigidly clamp the wall 51 of the head 58 against the wall 56 of the protuberance 55, thus. locking the boom 59 and housing 58 against relative rotation.

Theboom 59 may also be locked against rotation relative to the stanchion 48 by tightening the nuts 54, which will cause the clamping action of the housing 58 on the stanchion 48.

Due to the swivel connection between the arm 84 and the boom 59, it will also be understood that the former may be moved laterally of the 'boom in any desired position within an arc of substantially 180, ,and may be locked against movement relative to the bracket I4 by tightening the nut 81. The bracket I4 being rotatably mounted within the end of the boom 59, permits further adjustment of the arm 84. When the arm is rotated in the desired position, the nut I9 may be tightened, thus locking the bracket I4 and boom 59 against relative movement.

By loosemng the nut 46 which normally secures the cross frame 38 on the carrying frame l5, it will be understood that the entire cross frame and derrick like mechanism carried thereby may be slid relative to the carrying frame for adjusting the drill guiding frame 89 longitudinally of the carrying frame through the open end thereof. Due to the elongated shape of the openings 44 through which extend the bolts 45, the cross frame 38 will be free to slide on the carrying frame l5 irrespective of a slight divergence between the side members' I6 and I1. When the cross frame 38 is slid or positioned toward the open end of the carrying frame, it is advisable to drive the peg 93, which is carried by the drill guiding frame 89, into the rock to be drilled, thus 2,104,841 preventing the weight of the drilling mechanism to cause the tilting of the drilling rig, and also assisting in securing the drilling mechanism against movement relative to the rock.

From the foregoing, it will be seen that the drill guiding frame 89 may be moved in drilling position outside of the marginal edge of the carrying frame as shown in Fig. 5. It may also be positioned above or below the carrying frame due to the pivotal movement of the boom 59 through the open end of the carrying frame, and may be revolved 360 around the stanchion 48, permitting thereby the drill guiding frame 89 to be moved in innumerable drilling positions relative to the carrying frame l5.

Although the foregoing description is necessarily of a detailed character, in order to completely set forth the invention, it is to be understood that the specific terminology is not intended to be restrictive or confining and it is to be further understood that various rearrangements of parts and modification of structural detail may be resorted to without departing from the scope or spirit of the invention as herein claimed.

I claim: 1

1. In a portable drilling rig, the combination of a carrying frame, supporting means for said frame, a boom carried by said frame, means pivotally connecting one end of said boom to said frame for pivotal movement on a horizontal and on a vertical axis relative to said frame, a brace associated with said boom adjustable in length for effecting the pivotal movement of the boom on said horizontal axis, a .drill guiding frame carried by the other end of said .boom, and

clamping means forming a part of said pivotally connecting means for establishing a rigid connection between said frames in any position assumed by said drill guiding frame due to the pivotal movements of said boom.

, 2. In a portable drilling rig, the combination of a carrying frame, supporting means for said frame, a shaft carried by said frame in perpendicular relation therewith, a housing rotatably carried by said shaft, a boom like member having the lower end thereof connected to said housing for rotation therewith around the center axis of said shaft and for pivotal movement on an axis perpendicular thereto, a drill guiding frame carried by the other end of said boom, and means for establishing a rigid connection between said frames in any position assumed by said drill guiding frame due to the rotation and pivotal movement of said boom.

3. In a portable drilling rig, the combination of a carrying frame, supporting means for said frame, a shaft carried by said frame in perpendicular relation therewith, a derrick carried by said shaft including a boom capable of swinging movement around the center axis of said shaft and on an axis perpendicular thereto, a brace carried by said shaft associated with said boom for swinging movement therewith on the center axis aforesaid, said brace being adjustable in length for effecting the swinging movement of said boom on said perpendicular axis, a drill guiding frame carried by the other end of said boom adjustable in various drilling positions relative to said carrying frame due to the swinging movement of said boom, and means for locking said frames against relative movement.

4. In a portable drilling rig, the combination of a carrying frame, supporting means for said frame, a boom carried by said frame, means pivotally connecting one end of said boom to said carrying frame in a manner whereby said boom is capable of swinging movement in a vertical and in a horizontal plane, an arm pivotally connected to the other end of said boom for swinging movement laterally of said boom, a drill guiding frame carried by said arm, and means for establishing a rigid connection between said frames in any position assumed by said drill guiding-frame due to the swinging movements of said arm and boom.

5. In a portable drilling rig, the combination of a carrying frame, supporting means for said frame, a boom carried by said frame, means pivotally connecting one end of said boom to said carrying frame above the latter in a mannei whereby said boom is capable of swinging movement in a vertical and horizontal plane, an arm connected to the other end ofsaid boom for swinging movement laterally of said boom, a drill guiding frame pivotally carried by said arm. and means for establishing a rigid connection between said frames in any position assumed by said drill guiding frame due to the pivotal move-' ment of said last frame and the swinging movements of said arm and boom.

6. In a portable drilling rig, the combination of a substantially U-shaped carrying frame formed with an open end, a substantially flat cross-frame longitudinally slidable on said carrying frame, an upright rigidly secured to said cross-frame, a housing rotatably carried by said upright, a boom carried by said housing for rotation therewith and'for swinging movement in a plane perpendicular to said carrying frame, a

drill guiding frame carried by said boom for longitudinal movement through the open end of the carrying frame due to the slidable movement of said cross frame, said drill guiding frame being adjustable in.height through the open end aforesaid due to the swinging movement of said boom and adjustable laterally of said carrying frame due to the rotation of said housing, and

means for locking said drill guiding frame against movement relative to said carrying frame.

7. In a portable drilling rig, the combination of a carrying frame, a boom having a drill guiding frame carried thereby, connecting means between said boom and carrying frame including means for adjusting said boom and drill guiding frame vertically /and.laterally of said carrying frame, a mechanism associated with said boom for effecting ,the vertical adjustment thereof and movable therewith transversally of said carrying frame, connecting means between said drill guiding frame and boom for moving the entire drill guiding frame from one to the other side of said boom, and means for locking said frames against relative movement.

8. In a portable drilling rig, the combination of a carrying frame, a boom, a drill guiding frame carried by one end of said boom, movable connecting means between said boom and carrying frame whereby said boom and drill guiding frame are adjustable vertically and laterally of said carrying frame, a mechanism associated with said boom for efl'ecting the vertical adjustment thereof and movable therewith transversally of said carrying frame, means swingingly connecting said drill guiding frame to the aforesaid end of said boom, and means for locking said frames against relative movement.

JOHN C. CURTIS. 

